Star Wars Conundrums

Reading a book introducing the Star Wars characters generated some
interesting questions from Kelton. Do light sabers have rechargeable
batteries?  Why not?  Where does Yoda live?  Does all Chewbacca's hair
grow from his head?  Is he smart?  Is there a person inside R2-D2? How
does Darth Vader go wee-wee in that suit? Why do bad guys wear black?
Next time I see a bad guy will he be wearing black?  Why don't real
bad guys wear black?  Why is mommy tired of talking.....